Diamond Bracket Forms and How to Count to Two; 3 of 10

This
form contains itself. That can be represented via re-entrance, thus:

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L= ||

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Let re-entrance permit any mark within a Brownian form
to extend a tendril to a distant space, where its endpoint shall be deemed
enclosed. This form sends a tendril into itself. Other re-entrant expressions
include:

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Self-reference can be expressed as a re-entrant
brownian form, as a switching circuit, as a vector of forms, as an indexed
list, and as a diamond-logic fixedpoint. For example: